# International Association for Hydro-Environment Engineering and Research

IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
 You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 8 - CLIMATE CHANGE AND HAZARD MITIGATION : A Study of Design Storm in an Urban Area of North China
 A Study of Design Storm in an Urban Area of North China Author : Xiang Wenyan and Huang Jinhui Due to the global changing climate,the hydrological cycle changed, hence impacting precipitation intensity, while the design storm is one of the most important criteria for retention\detention facilities and drainage systems, and could directly impact its security, so further study is essential. The paper took Tianjin City for an example, and used 52-year precipitation data to study the design storm. Two sampling methods were employed including annual maximum method and annual multisampling method. Four theoretical frequency distributions were employed including Gumbel Distribution, Generalized Extreme Value Distribution, ExponentialDistribution and P-? Distribution, while the first two frequency methods were utilized for analysis of sample from annual maximum method and the latter two methods were utilized for analysis of sample from annual multisampling method. For the assessment of the goodness-of-fit for the results of theoretical frequency analysis, the coefficient of determination is utilized. Intensity-Duration-Frequency (I-D-F) curve was obtained from the theoretical frequency analysis, from which the design storm equations was obtained by Gauss-Newton Method and the standard deviation and relative standard deviation were used to assess the goodness of fit of the equations. The conclusion is that the annual multisampling method is better than annual maximum method, and that for the four theoretical frequency distributions, the P-?distribution is most suitable in the city of Tianjin, so it is strongly recommended that the design storm can be revised through P-? distribution under the joint efforts of scholars and the government to guarantee the demand of design purpose. File Size : 215,783 bytes File Type : Adobe Acrobat Document Chapter : IAHR World Congress Proceedings Category : 35th IAHR Congress - Chengdu (2013) Article : THEME 8 - CLIMATE CHANGE AND HAZARD MITIGATION Date Published : 20/07/2016 Download Now